Improvement in self-closing cocks



M.-,s. CLARK.

Self-Closing Cocks.

NO. 141,630. `PatentedAugust12,1873.

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UNITED STATES PATENT Orrrcrj..

MINFORD S. CLARK, OF NEW YORK, N. Y., ASSIGNOR TO lCHARLES HARRISON, OFSAME PLACE.

IMPROVEMENT IN SELF-CLOSING COC-KS.

Specification forming part of Letters Patent No. 141,630, dated August12, 1873 application filed April 24, 1873.

To all whom it may concern:

Be it known that I, MINFORD S. CLARK, of the city, county, and State ofNew York, have invented certain Improvements in Self-Glosing Cocks, ofwhich the following is a specification:

My invention consists in the described mode of constructing andarranging the variable chamber of a self-closing cock, rst, withrespectto the shell of the valve-chamber 5 and, secondly, with respectto the peculiar enlargement of the valve-stem, the object of the latterpeculiarity being to dispense with the use of a cup-leather valve.

My invention is applicable to all variable chamber-cocks, but I havepreferred to ex hibit it as applied to cocks having an adjustable outletfor the discharge of the variable chamber. The accompanying drawing isaccordingly a'longitudinal view, partly in section, of a cock of thisclass, such as will be found niorefully described in Charles Harrisonspatent, No. 92,190, dated July 6, 1869.

It will be seen that the variable chamber is formed within an innercylinder, a, contained within the shell of. the cock X. An innercylinder or sleeve is found in the patent of Charles H. Miller, No.71,510, dated November 26, 1867; but Millers sleeve extends down to thevalve-seat, and constitutes an inner casin g for the entirevalve-chamber. My inner cylinder, on the contrary, occupies only thatpart of the shell which is appropriated to the purpose of a variablechamber, and is of considerably less dia-meter than the valve-chamber,so that there is an annular space between the outside of the variablechamber-cylinder vand the inner wall of the valve chamber or shell, and,of course, a large annular space between the inner wall of the shell andthe periphery of the variable chamber-plug. This arrangement of thevariable chamber with relation to the valve-shell improves theefficiency of the cock by increasing the facility with which thevariable chamber is lled when the cock is only partially opened, first,because the variable chamber, owing to its reduced capacity, is filledmore quickly; and, secondly, because of the ample room provided for thepassage of uid into the variable chamber. It will be seen that when thecock is opened the plug is pushed into a cylindrical mass of liquidconsiderably larger in diameter than itself.

The construction is as follows: The cylinder a is provided with a heavyflange, al, which bears upon the shoulder a2, upon which it is rigidlyheld by the cap X. An elastic packing-ring, a3, is introduced betweenthe liange and the shoulder, and the usual packing m2 between the end ofthe cylinderA and the cap X'. The iianged end of the inner cylinder thusperforms the function ofthe metallic washer usually introduced for thepurpose of confining the packing x2. The i11- ner end of the cylinder ais provided with the annular packing b, which is held in-position by theannular cap b', when the latter is screwed on the outside of thecylinder a. The packing-ring b fits closely to the enlarged valve-stemc, which serves as a plug to close the mouth of the cylinder a after thevalve o1 has commenced to move toward its seat in obedience to theaction of the spiral spring c2.

The interior of the cylinder a constitutes the variablechamber, and isnearly filled by the plug c when the valve is at rest. The plug c isslightly tapered, and is partially grooved or corrugated on the endtoward the variable chamber, so that when the `valve-stern is depressed,as shown in the drawing, the plug ceases to completely ll the aperturesurrounded by the packing-ring b, and thus allows the variable chamberto be illed with iluid. As the plug moves back it lls the mouth of thevariable chamber, and thus forces the contained -uid out through thelateral aperture f and into an annular chamber formed by a groove, f1,in the periphery of the flange a1. This groove is opposite the outlet f2, by means of which the variable chamberis discharged. The dischargethrough the outlet f2- is regulated by means of the cock f3, and I havetherefore designated this class of cocks as a class having adjustableoutlets from the variable chambers.

In applying my invention to cocks not provided with the outlet f 2 inthe shell X 0f the variable chamber, the lateral aperture f, instead ofbeing made through the flange a1, will be made through the shell of thecylinder a, between the annular cap b and the packing a3, and thus thefluid from the variable chamber will be discharged into the valvechamberthrough the annular space f4 between the cylinder a and the shell of thevalve-chamber X.

I claim as my invention- 1. In a self-closing cock, the inner cylindera, provided with the lateral aperture f and with the reciprocating`piston or plunger c, and arranged in relation to the Valve-shell X,

substantially in the manner described, and for the purpose set forth.

2. The combination of the lateral opening f, the annular groove f1, andthe outlet f2 with the cylinder a, the reciprocating piston or plug c,and the packin g-rin g b, substantially as described.

3. rlhe partly tapered or corrugated plug c, in combination with thevariable chamber of a self-closing cock, substantially as described.

MINFORD S. CLARK. Witnesses:

EDWD. PAYsoN, Gmo. W. MIATT.

